Lithium ion battery

A lithium-ion battery and non-aqueous electrolyte technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems affecting battery performance, peeling, negative electrode powdering, etc., to improve interface conditions, reduce impedance, high energy effect of density

Active Publication Date: 2022-02-11
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the charging and discharging process, the volume expansion of Si can reach more than 300%, and the internal stress generated by the drastic volume change can easily lead to the powdering and peeling of the negative electrode, which affects the performance of the battery.

Method used

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Examples

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Embodiment Construction

[0062] The present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0063] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0064] In the description of the present invention, it should be noted that the terms "first", "second" and so on are only used for descriptive purposes, and do not indicate or imply relative importance.

[0065] Examples and comparative examples

[0066] (1) Preparatio...

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Abstract

A lithium ion battery provided by the invention has excellent cycle life and relatively low cycle expansion rate while having high energy density, DTD, FEC and a carboxylic ester organic solvent are introduced into a non-aqueous electrolyte, the relationship between the content X of a negative electrode binder in a negative electrode plate and the content A of the DTD, the content B of the FEC and the content Y of a carboxylic ester organic solvent in the non-aqueous electrolyte is further adjusted, and the relationship meets the following conditions: 10 < = A + B < = 21, 0.02 < = X/(A + B + Y) < = 0.2, and 0.02 < = X/Y < = 0.25. A stable and low-impedance SEI interface can be formed on the surface of the negative electrode, so that the low-temperature charging performance and the high-rate discharging performance of the battery are improved; meanwhile, the conductivity of the electrolyte at low temperature and the migration rate of lithium ions can be improved, and the low-temperature charging performance and the high-rate discharging performance of the battery are further improved; in addition, the cyclic expansion rate of the lithium ion battery can be reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery. Background technique [0002] In recent years, high-energy-density lithium-ion batteries have always been a hot topic in scientific research and industrial research; increasing the energy density of lithium-ion batteries can significantly improve the performance of end products, such as smart electronic products will obtain higher battery life. Improving the gram capacity of materials is the main means to increase the energy density of lithium-ion batteries. The theoretical specific capacity of silicon (Si)-based negative electrode materials is as high as 4200mAh / g, and its lithium intercalation and desorption platform is more suitable. It is an ideal high-capacity negative electrode material for lithium-ion batteries. [0003] However, during the charging and discharging process, the volume expansion of Si can reach more than 300...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0525H01M4/62H01M10/0567
CPCH01M10/0569H01M10/0525H01M10/0567H01M4/621H01M4/622Y02E60/10
Inventor 郭盼龙储霖陈伟平李素丽曾长安
Owner ZHUHAI COSMX BATTERY CO LTD
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